Padlock with a hard shell casing for receiving a cylinder lock unit

Abstract

A padlock consisting of an elongated lock casing, comprising an inner, solid member and an outer shell fitting over the same. The outer shell is made of a material protected against drilling or the like burglary attempts. The inner, solid member is made of a relatively soft material such as iron or other non-ferrous metal. A U-shaped shackle is adapted to be inserted into the casing and locked by a key-operated, cylinder-type locking device installed at one end of the lock casing.

What is claimed is: 
     
       1. A padlock comprising: an elongated lock casing, the casing having bores extending in from its periphery, a U-shaped shackle adapted to be inserted into the bores in the casing, a key-operated, cylinder-type locking device installed at one end of the lock casing for locking the shackles in the casing bores;   the casing comprising:   an inner solid member made of a material which is substantially unprotected against drilling or the like burglary attempts; the inner member having opposite end portions;   an outer tubular shell fitted over the inner member and made of a material protected against drilling or the like burglary attempts; the outer shell also having opposite end portions;   a respective cup shaded end cover being fitted over each end portion of the inner member, the end cover being at least partly covered by a corresponding end portion of the shell;   recesses formed at the inner member end portions, and the end covers being received in the respective recesses, each inner member end portion being provided with releasable fastening means for holding its respective end cover;   each cover has a circumferential rim portion with an opening formed in it, each cover fastening means comprise a spring-urged detent adapted to project, in its fastening position, into the opening formed in the circumferential rim portion of the respective end cover, so that the detent becomes protectively covered by the shell.   
     
     
       2. The padlock as claimed in claim 1 comprising releasable shell fastening means fastening the shell to the inner member. 
     
     
       3. The padlock as claimed in claim 2 wherein an opening is formed in a central portion of the shell, the shell fastening means comprise a spring-urged detent adapted to project, in its fastening position, into the opening formed in the central portion of the shell. 
     
     
       4. The padlock as claimed in claim 3 wherein one of the end covers is mounted at the end of the casing accommodating the cylinder locking device and the one end cover is formed with a slot profiled so as to limit the angular rotation of a key in the locking device. 
     
     
       5. The padlock as claimed in claim 4 wherein the inner member is cylindrical. 
     
     
       6. The padlock as claimed in claim 5 wherein the shell consists of a length of pipe. 
     
     
       7. The padlock as claimed in claim 6 wherein the inner member is made of cast metal, and the shell and end covers are made of hardened steel. 
     
     
       8. The padlock as claimed in claim 7 wherein the cylinder locking device is freely seated within a cavity formed at the one end of the inner member.